Radiofrequency transformer



June 1 1,926. I 1,587,373

C. R. FRENCH RADIO FREQUENCY TRANSFORMER Filed June 18 1825 awenl'or 0'. Rfrencfz Q I m I Patented done i,

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Application filed June 18, 1925.

This invention relates to improvements in constructions of radio frequency trans formers and particularly to a transformer of this type adapted for use in conjunction with radio receiving se s.

An object of the invention resides in providirn;- a radio frequency transformer for radio sets adapted to provide an air core and suit-able supports for the primary and secondary windings which are preferably constructed in a predetermined manner in order to provide a low loss structure.

Another object of the invention resides in providing a moun ing for the primary and secondary windings of the transformer construction wherein suitable supporting ele ments are provided for the secondary which are mounted in spaced. relation in prede terinined manner and held by suitable spacing means which supports the primary winding, and wherein a suitable housing is formed of separable parts wh it receives the coil supporting structure and through a single securing means mounts the parts of the ho sing); and the coiled structure in assembled relation.

and improvements in the details of construction and arrangement of parts which are more pt icularly pointed out in the tel-- lowing iled desorption directed to a preferred .02'111 or" the invention, it being understood however, that various changes in the size, shape and arrangement the parts may be made in order to adapt the construction to supporting the primary and secondary windings in di'l'lerent predetermined relation without departing from the spirit or scope of the invention as herein set forth.

in the drawings Forming part of this application Figure 1 is a vertical transverse sectional view through the assembled transformer.

Fig. 2 is a longitudinal sectional View on a plane passing through the axis of the coil indicated by the line 22 in Fig. l.

Fig. 3 is an enlarged plan view of a section out the coil supporting structure showing the manner of mounting and spacing; the windings ot' a lattice wound secondary coil.

Fig. is an end elevation of the housing containing the coils.

The coil supporting structure includes a plurality of flat annular ring members 1 preferably formedof suitable insulating masei-au in. 38,016.

extend herethrouph and through suitable openings in the rings 1 and serve to retain the and sleeves in proper assembled spaced relation. The cnds ot the rods 5 e: d beyond the ends of the and the rings and receive short spacing sleeves 6 te-rminating shortol the ends of the rods for spacing the end plates or disks 7 or the housing from the of the coiz and the end ring;- members. The project in o ends of the rods are received \Yli'lllfisuitable sockets 8 in the end plates, whic rods and spacing sleeves form the me determining the position of the end dislti in the assembled relation oi the parts. l' i in-drical casing; 9 is received within the ibeted edge of the end disk and coopera we therewith to form a. dust ol flil housing tor the coil mounting structure. 7

A bar 10 extends through the central per t on of the housing and openings in the disk 7 and is threaded the ends to rem n t ll which when tighteneda ain serve to loci; the pa ts in tion.

with v eauall i' spaced relation on the peripheries thereof "lhe spacing sleeve are provi annular grooves 12 in suostantiall and which are adapted'to a the coil windings oi the primary coil 13. The priinary coil winding as disclosed in the drawing particularly in Figs. 1 and E2, a heli winding}; in which the ad acent convolution; are mounted in spaced relation as il ustrated. The ends oi these windings aresecured to suitable binding posts 14 mounted on the end disk 7 so that the coil may be inter posed in the proper manner in a radio ceivinp; circuit. The ring; members 1 form the supports for the special form of secondary winding used in this transformer which is termed in the art as the lattice type Winding. 2. A transformer, coinprisin a coil supporting structure having :1 plurality 03f air 0 nuhir coil supporting members, spacing members for said coil supporting members, holding means mounting said spacing means and coil suooori ing nieinha one coii win iortiiig XDQiilbL d by LLHL sup Wmdin sui ported by sectional 1 sccom my windiir" coii for the ietii c in a From this con ily undo I 0 the coils are emh of the cci 90 by air spacing lity oi. said 11' air core therefor.

construcion of t 2 the ii in. i 1 and spacing; members, a

' j seciieu for receiving L a. pmr ("i end "rllciui'e, s.

iding means, and 11.33; said end plates and coil support-- relation. g a coil supieai form on :1 plurality oi 1i time rite memo rings 1 iiigned rei i ii 1 remove. a a K "I"; ineinb in 21 ibled 1 of The c coil wind inoun ed on assembled hers. a see-en 1211 ceii w men spaced circu 'iindricui ho: -eii simporiimxiii.

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n. was said 1 end (30111 PL i 'ing 1 plurality of c nieineers moui ging one and holding 11162 in prede positioni spaced reizlueu, a

said means, a. sectional housing supporting structure remombhg iiiou said inez'z s, and securinq w'v'ithin s; 1d housing. I I 2111K my signature. means ror he the housing in assembled relation. C RLES 1%. FREFCH. 

